Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the annotations (readOnlyHint=false, openWorldHint=true), the description reveals significant behavioral traits: it consumes a credit, requires a funded account, and may be blocked in sandboxed environments for photo_id. It also imposes an ethical constraint against animating public figures. This goes well beyond what annotations already disclose.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is slightly long but every sentence adds necessary value—purpose, cost, input methods, and ethics. It is well-structured and front-loaded with the core action. It could be tightened slightly, but it is not verbose or redundant.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (4 params, nested image_file object, output schema exists), the description covers input methods, costs, prerequisites, and ethical boundaries. It also implicitly addresses the output by referencing a video, and the output schema handles return details. It is complete for the intended use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Even though the schema descriptions cover all parameters, the description adds crucial priority information: it recommends image_url over others, explains that image_file is auto-populated by ChatGPT, and details the photo_id workflow with potential sandbox blocking. This enriches the schema semantics significantly.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource: 'Anime une photo ancienne en une courte vidéo naturelle'. It clearly distinguishes this tool from siblings like get_animation_status and confirm_upload, which serve different purposes. The scope is well-defined.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly explains when to use each input method (image_url preferred, image_file auto-filled, photo_id via create_upload/confirm_upload) and provides ethical guidance on only animating photos the user has rights to. It also states the credit requirement and no-free-trial condition, giving clear context for when the tool is applicable.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.